Xcode Source Extensions Setup
First do this If you're running this on OS X 10.11 like I am, you'll need to run sudo /usr/libexec/xpccachectl in terminal and reboot before Xcode will even attempt to load your extensions. It has something to do with new SDKs being installed and the XPC service in El Capitan not expecting it. Then choose there https://github.com/tib/awesome-xcode-extensions